This 7 Day Addiction Shirt is 100% Performance Polyester. SPF protection and great comfort. This design was inspired by the love of butterflies a lovely young lady had, but the lack of love she had for fishing. Our goal was for her to wear a fishing shirt. We took the design of a redfish tail tailing and the reflection of the tail had on the water and mirrored it. And the Redfish Butterfly was born. After seeing this design done our first reaction was "what a Beautiful Catch".